diff -r 000000000000 -r 6474c204b198 dom/media/tests/mochitest/constraints.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/media/tests/mochitest/constraints.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,76 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+  Tests covering gUM constraints API for audio, video and fake video. Exercise
+  successful parsing code and ensure that unknown required constraints and
+  overconstraining cases produce appropriate errors.
+
+  TODO(jib): Merge desktop and mobile version of these tests again.
+*/
+var common_tests = [
+  // Each test here tests a different constraint or codepath.
+  { message: "unknown required constraint on video fails",
+    constraints: { video: { somethingUnknown:0, require:["somethingUnknown"] },
+                   fake: true },
+    error: "NO_DEVICES_FOUND" },
+  { message: "unknown required constraint on audio fails",
+    constraints: { audio: { somethingUnknown:0, require:["somethingUnknown"] },
+                   fake: true },
+    error: "NO_DEVICES_FOUND" },
+  { message: "video overconstrained by facingMode fails",
+    constraints: { video: { facingMode:'left', require:["facingMode"] },
+                   fake: true },
+    error: "NO_DEVICES_FOUND" },
+  { message: "audio overconstrained by facingMode fails",
+    constraints: { audio: { facingMode:'left', require:["facingMode"] },
+                   fake: true },
+    error: "NO_DEVICES_FOUND" },
+  { message: "Success-path: optional video facingMode + audio ignoring facingMode",
+    constraints: { fake: true,
+                   audio: { facingMode:'left',
+                            foo:0,
+                            advanced: [{ facingMode:'environment' },
+                                       { facingMode:'user' },
+                                       { bar:0 }] },
+                   video: { // TODO: Bug 767924 sequences in unions
+                            //facingMode:['left', 'right', 'user', 'environment'],
+                            //require:["facingMode"],
+                            facingMode:'left',
+                            foo:0,
+                            advanced: [{ facingMode:'environment' },
+                                       { facingMode:'user' },
+                                       { bar:0 }] } },
+    error: null }
+];
+
+
+/**
+ * Starts the test run by running through each constraint
+ * test by verifying that the right callback and error message is fired.
+ */
+
+function testConstraints(tests) {
+  var i = 0;
+  next();
+
+  function Success() {
+    ok(!tests[i].error, tests[i].message);
+    i++;
+    next();
+  }
+  function Failure(err) {
+    ok(tests[i].error? (err === tests[i].error) : false,
+       tests[i].message + " (err=" + err + ")");
+    i++;
+    next();
+  }
+  function next() {
+    if (i < tests.length) {
+      navigator.mozGetUserMedia(tests[i].constraints, Success, Failure);
+    } else {
+      SimpleTest.finish();
+    }
+  }
+};